b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * linux/fs/hfsplus/bnode.c
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * Copyright (C) 2001
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) * Brad Boyer (flar@allandria.com)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * (C) 2003 Ardis Technologies <roman@ardistech.com>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) * Handle basic btree node operations
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) #include <linux/slab.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) #include <linux/pagemap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) #include <linux/fs.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) #include <linux/swap.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 17)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) #include "hfsplus_fs.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19) #include "hfsplus_raw.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 20)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 21) /* Copy a specified range of bytes from the raw data of a node */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22) void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 24) struct page **pagep;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 25) int l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 26)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27) off += node->page_offset;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 28) pagep = node->page + (off >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 29) off &= ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 31) l = min_t(int, len, PAGE_SIZE - off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) memcpy(buf, kmap(*pagep) + off, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 35) while ((len -= l) != 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) buf += l;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 37) l = min_t(int, len, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 38) memcpy(buf, kmap(*++pagep), l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 42)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) __be16 data;
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 46) /* TODO: optimize later... */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) hfs_bnode_read(node, &data, off, 2);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) return be16_to_cpu(data);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 49) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 50)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 51) u8 hfs_bnode_read_u8(struct hfs_bnode *node, int off)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53) u8 data;
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 54) /* TODO: optimize later... */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) hfs_bnode_read(node, &data, off, 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) return data;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59) void hfs_bnode_read_key(struct hfs_bnode *node, void *key, int off)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) struct hfs_btree *tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) int key_len;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) tree = node->tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 65) if (node->type == HFS_NODE_LEAF ||
324ef39a8a4f6 (Vyacheslav Dubeyko 2013-02-27 17:03:04 -0800 66) tree->attributes & HFS_TREE_VARIDXKEYS ||
324ef39a8a4f6 (Vyacheslav Dubeyko 2013-02-27 17:03:04 -0800 67) node->tree->cnid == HFSPLUS_ATTR_CNID)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 68) key_len = hfs_bnode_read_u16(node, off) + 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 69) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 70) key_len = tree->max_key_len + 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 71)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72) hfs_bnode_read(node, key, off, key_len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 73) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75) void hfs_bnode_write(struct hfs_bnode *node, void *buf, int off, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) struct page **pagep;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) int l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) off += node->page_offset;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 81) pagep = node->page + (off >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 82) off &= ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 84) l = min_t(int, len, PAGE_SIZE - off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) memcpy(kmap(*pagep) + off, buf, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89) while ((len -= l) != 0) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) buf += l;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 91) l = min_t(int, len, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92) memcpy(kmap(*++pagep), buf, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 95) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 96) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 98) void hfs_bnode_write_u16(struct hfs_bnode *node, int off, u16 data)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 99) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100) __be16 v = cpu_to_be16(data);
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 101) /* TODO: optimize later... */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) hfs_bnode_write(node, &v, off, 2);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) void hfs_bnode_clear(struct hfs_bnode *node, int off, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) struct page **pagep;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108) int l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) off += node->page_offset;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 111) pagep = node->page + (off >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 112) off &= ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113)
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 114) l = min_t(int, len, PAGE_SIZE - off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115) memset(kmap(*pagep) + off, 0, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119) while ((len -= l) != 0) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 120) l = min_t(int, len, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 121) memset(kmap(*++pagep), 0, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 122) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 123) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 124) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 125) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 126)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 127) void hfs_bnode_copy(struct hfs_bnode *dst_node, int dst,
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 128) struct hfs_bnode *src_node, int src, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 129) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 130) struct page **src_page, **dst_page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 131) int l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 132)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 133) hfs_dbg(BNODE_MOD, "copybytes: %u,%u,%u\n", dst, src, len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 134) if (!len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 135) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 136) src += src_node->page_offset;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 137) dst += dst_node->page_offset;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 138) src_page = src_node->page + (src >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 139) src &= ~PAGE_MASK;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 140) dst_page = dst_node->page + (dst >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 141) dst &= ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 142)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 143) if (src == dst) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 144) l = min_t(int, len, PAGE_SIZE - src);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 145) memcpy(kmap(*dst_page) + src, kmap(*src_page) + src, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 146) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 147) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 148) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 149)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 150) while ((len -= l) != 0) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 151) l = min_t(int, len, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 152) memcpy(kmap(*++dst_page), kmap(*++src_page), l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 153) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 154) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 155) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 156) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 157) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 158) void *src_ptr, *dst_ptr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 159)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 160) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 161) src_ptr = kmap(*src_page) + src;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 162) dst_ptr = kmap(*dst_page) + dst;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 163) if (PAGE_SIZE - src < PAGE_SIZE - dst) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 164) l = PAGE_SIZE - src;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 165) src = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 166) dst += l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 167) } else {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 168) l = PAGE_SIZE - dst;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 169) src += l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 170) dst = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 171) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 172) l = min(len, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 173) memcpy(dst_ptr, src_ptr, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 174) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 175) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 176) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 177) if (!dst)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 178) dst_page++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 179) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 180) src_page++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 181) } while ((len -= l));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 182) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 183) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 184)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 185) void hfs_bnode_move(struct hfs_bnode *node, int dst, int src, int len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 186) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 187) struct page **src_page, **dst_page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 188) int l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 189)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 190) hfs_dbg(BNODE_MOD, "movebytes: %u,%u,%u\n", dst, src, len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 191) if (!len)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 192) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 193) src += node->page_offset;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 194) dst += node->page_offset;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 195) if (dst > src) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 196) src += len - 1;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 197) src_page = node->page + (src >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 198) src = (src & ~PAGE_MASK) + 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 199) dst += len - 1;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 200) dst_page = node->page + (dst >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 201) dst = (dst & ~PAGE_MASK) + 1;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 202)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 203) if (src == dst) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 204) while (src < len) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 205) memmove(kmap(*dst_page), kmap(*src_page), src);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 206) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 207) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 208) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 209) len -= src;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 210) src = PAGE_SIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 211) src_page--;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 212) dst_page--;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 213) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 214) src -= len;
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 215) memmove(kmap(*dst_page) + src,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 216) kmap(*src_page) + src, len);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 217) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 218) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 219) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 220) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 221) void *src_ptr, *dst_ptr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 222)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 223) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 224) src_ptr = kmap(*src_page) + src;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 225) dst_ptr = kmap(*dst_page) + dst;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 226) if (src < dst) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 227) l = src;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 228) src = PAGE_SIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 229) dst -= l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 230) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 231) l = dst;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 232) src -= l;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 233) dst = PAGE_SIZE;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 234) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 235) l = min(len, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 236) memmove(dst_ptr - l, src_ptr - l, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 237) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 238) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 239) kunmap(*dst_page);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 240) if (dst == PAGE_SIZE)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 241) dst_page--;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 242) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 243) src_page--;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 244) } while ((len -= l));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 245) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 246) } else {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 247) src_page = node->page + (src >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 248) src &= ~PAGE_MASK;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 249) dst_page = node->page + (dst >> PAGE_SHIFT);
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 250) dst &= ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 251)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 252) if (src == dst) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 253) l = min_t(int, len, PAGE_SIZE - src);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 254) memmove(kmap(*dst_page) + src,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 255) kmap(*src_page) + src, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 256) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 257) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 258) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 259)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 260) while ((len -= l) != 0) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 261) l = min_t(int, len, PAGE_SIZE);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 262) memmove(kmap(*++dst_page),
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 263) kmap(*++src_page), l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 264) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 265) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 266) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 267) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 268) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 269) void *src_ptr, *dst_ptr;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 270)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 271) do {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 272) src_ptr = kmap(*src_page) + src;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 273) dst_ptr = kmap(*dst_page) + dst;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 274) if (PAGE_SIZE - src <
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 275) PAGE_SIZE - dst) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 276) l = PAGE_SIZE - src;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 277) src = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 278) dst += l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 279) } else {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 280) l = PAGE_SIZE - dst;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 281) src += l;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 282) dst = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 283) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 284) l = min(len, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 285) memmove(dst_ptr, src_ptr, l);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 286) kunmap(*src_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 287) set_page_dirty(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 288) kunmap(*dst_page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 289) if (!dst)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 290) dst_page++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 291) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 292) src_page++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 293) } while ((len -= l));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 294) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 295) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 296) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 297)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 298) void hfs_bnode_dump(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 299) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 300) struct hfs_bnode_desc desc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 301) __be32 cnid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 302) int i, off, key_off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 303)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 304) hfs_dbg(BNODE_MOD, "bnode: %d\n", node->this);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 305) hfs_bnode_read(node, &desc, 0, sizeof(desc));
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 306) hfs_dbg(BNODE_MOD, "%d, %d, %d, %d, %d\n",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 307) be32_to_cpu(desc.next), be32_to_cpu(desc.prev),
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 308) desc.type, desc.height, be16_to_cpu(desc.num_recs));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 309)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 310) off = node->tree->node_size - 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 311) for (i = be16_to_cpu(desc.num_recs); i >= 0; off -= 2, i--) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 312) key_off = hfs_bnode_read_u16(node, off);
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 313) hfs_dbg(BNODE_MOD, " %d", key_off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 314) if (i && node->type == HFS_NODE_INDEX) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 315) int tmp;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 316)
324ef39a8a4f6 (Vyacheslav Dubeyko 2013-02-27 17:03:04 -0800 317) if (node->tree->attributes & HFS_TREE_VARIDXKEYS ||
324ef39a8a4f6 (Vyacheslav Dubeyko 2013-02-27 17:03:04 -0800 318) node->tree->cnid == HFSPLUS_ATTR_CNID)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 319) tmp = hfs_bnode_read_u16(node, key_off) + 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 320) else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 321) tmp = node->tree->max_key_len + 2;
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 322) hfs_dbg_cont(BNODE_MOD, " (%d", tmp);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 323) hfs_bnode_read(node, &cnid, key_off + tmp, 4);
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 324) hfs_dbg_cont(BNODE_MOD, ",%d)", be32_to_cpu(cnid));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 325) } else if (i && node->type == HFS_NODE_LEAF) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 326) int tmp;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 327)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 328) tmp = hfs_bnode_read_u16(node, key_off);
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 329) hfs_dbg_cont(BNODE_MOD, " (%d)", tmp);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 330) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 331) }
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 332) hfs_dbg_cont(BNODE_MOD, "\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 333) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 334)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 335) void hfs_bnode_unlink(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 336) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 337) struct hfs_btree *tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 338) struct hfs_bnode *tmp;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 339) __be32 cnid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 340)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 341) tree = node->tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 342) if (node->prev) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 343) tmp = hfs_bnode_find(tree, node->prev);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 344) if (IS_ERR(tmp))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 345) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 346) tmp->next = node->next;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 347) cnid = cpu_to_be32(tmp->next);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 348) hfs_bnode_write(tmp, &cnid,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 349) offsetof(struct hfs_bnode_desc, next), 4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 350) hfs_bnode_put(tmp);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 351) } else if (node->type == HFS_NODE_LEAF)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 352) tree->leaf_head = node->next;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 353)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 354) if (node->next) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 355) tmp = hfs_bnode_find(tree, node->next);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 356) if (IS_ERR(tmp))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 357) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 358) tmp->prev = node->prev;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 359) cnid = cpu_to_be32(tmp->prev);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 360) hfs_bnode_write(tmp, &cnid,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 361) offsetof(struct hfs_bnode_desc, prev), 4);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 362) hfs_bnode_put(tmp);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 363) } else if (node->type == HFS_NODE_LEAF)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 364) tree->leaf_tail = node->prev;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 365)
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 366) /* move down? */
b2837fcf4994e (Anton Salikhmetov 2010-12-16 18:08:41 +0200 367) if (!node->prev && !node->next)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 368) hfs_dbg(BNODE_MOD, "hfs_btree_del_level\n");
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 369) if (!node->parent) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 370) tree->root = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 371) tree->depth = 0;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 372) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 373) set_bit(HFS_BNODE_DELETED, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 374) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 375)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 376) static inline int hfs_bnode_hash(u32 num)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 377) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 378) num = (num >> 16) + num;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 379) num += num >> 8;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 380) return num & (NODE_HASH_SIZE - 1);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 381) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 382)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 383) struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 384) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 385) struct hfs_bnode *node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 386)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 387) if (cnid >= tree->node_count) {
e46707d153318 (Fabian Frederick 2014-06-06 14:36:25 -0700 388) pr_err("request for non-existent node %d in B*Tree\n",
e46707d153318 (Fabian Frederick 2014-06-06 14:36:25 -0700 389) cnid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 390) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 391) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 392)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 393) for (node = tree->node_hash[hfs_bnode_hash(cnid)];
b2837fcf4994e (Anton Salikhmetov 2010-12-16 18:08:41 +0200 394) node; node = node->next_hash)
b2837fcf4994e (Anton Salikhmetov 2010-12-16 18:08:41 +0200 395) if (node->this == cnid)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 396) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 397) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 398) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 399)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 400) static struct hfs_bnode *__hfs_bnode_create(struct hfs_btree *tree, u32 cnid)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 401) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 402) struct hfs_bnode *node, *node2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 403) struct address_space *mapping;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 404) struct page *page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 405) int size, block, i, hash;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 406) loff_t off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 407)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 408) if (cnid >= tree->node_count) {
e46707d153318 (Fabian Frederick 2014-06-06 14:36:25 -0700 409) pr_err("request for non-existent node %d in B*Tree\n",
e46707d153318 (Fabian Frederick 2014-06-06 14:36:25 -0700 410) cnid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 411) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 412) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 413)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 414) size = sizeof(struct hfs_bnode) + tree->pages_per_bnode *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 415) sizeof(struct page *);
f8314dc60ccba (Panagiotis Issaris 2006-09-27 01:49:37 -0700 416) node = kzalloc(size, GFP_KERNEL);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 417) if (!node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 418) return NULL;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 419) node->tree = tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 420) node->this = cnid;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 421) set_bit(HFS_BNODE_NEW, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 422) atomic_set(&node->refcnt, 1);
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 423) hfs_dbg(BNODE_REFS, "new_node(%d:%d): 1\n",
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 424) node->tree->cnid, node->this);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 425) init_waitqueue_head(&node->lock_wq);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 426) spin_lock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 427) node2 = hfs_bnode_findhash(tree, cnid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 428) if (!node2) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 429) hash = hfs_bnode_hash(cnid);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 430) node->next_hash = tree->node_hash[hash];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 431) tree->node_hash[hash] = node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 432) tree->node_hash_cnt++;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 433) } else {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 434) spin_unlock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 435) kfree(node);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 436) wait_event(node2->lock_wq,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 437) !test_bit(HFS_BNODE_NEW, &node2->flags));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 438) return node2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 439) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 440) spin_unlock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 441)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 442) mapping = tree->inode->i_mapping;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 443) off = (loff_t)cnid << tree->node_size_shift;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 444) block = off >> PAGE_SHIFT;
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 445) node->page_offset = off & ~PAGE_MASK;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 446) for (i = 0; i < tree->pages_per_bnode; block++, i++) {
090d2b185d868 (Pekka Enberg 2006-06-23 02:05:08 -0700 447) page = read_mapping_page(mapping, block, NULL);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 448) if (IS_ERR(page))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 449) goto fail;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 450) if (PageError(page)) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 451) put_page(page);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 452) goto fail;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 453) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 454) node->page[i] = page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 455) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 456)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 457) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 458) fail:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 459) set_bit(HFS_BNODE_ERROR, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 460) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 461) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 462)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 463) void hfs_bnode_unhash(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 464) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 465) struct hfs_bnode **p;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 466)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 467) hfs_dbg(BNODE_REFS, "remove_node(%d:%d): %d\n",
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 468) node->tree->cnid, node->this, atomic_read(&node->refcnt));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 469) for (p = &node->tree->node_hash[hfs_bnode_hash(node->this)];
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 470) *p && *p != node; p = &(*p)->next_hash)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 471) ;
0bf3ba538a150 (Eric Sesterhenn 2006-04-01 01:14:43 +0200 472) BUG_ON(!*p);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 473) *p = node->next_hash;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 474) node->tree->node_hash_cnt--;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 475) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 476)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 477) /* Load a particular node out of a tree */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 478) struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 479) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 480) struct hfs_bnode *node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 481) struct hfs_bnode_desc *desc;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 482) int i, rec_off, off, next_off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 483) int entry_size, key_size;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 484)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 485) spin_lock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 486) node = hfs_bnode_findhash(tree, num);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 487) if (node) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 488) hfs_bnode_get(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 489) spin_unlock(&tree->hash_lock);
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 490) wait_event(node->lock_wq,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 491) !test_bit(HFS_BNODE_NEW, &node->flags));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 492) if (test_bit(HFS_BNODE_ERROR, &node->flags))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 493) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 494) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 495) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 496) spin_unlock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 497) node = __hfs_bnode_create(tree, num);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 498) if (!node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 499) return ERR_PTR(-ENOMEM);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 500) if (test_bit(HFS_BNODE_ERROR, &node->flags))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 501) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 502) if (!test_bit(HFS_BNODE_NEW, &node->flags))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 503) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 504)
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 505) desc = (struct hfs_bnode_desc *)(kmap(node->page[0]) +
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 506) node->page_offset);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 507) node->prev = be32_to_cpu(desc->prev);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 508) node->next = be32_to_cpu(desc->next);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 509) node->num_recs = be16_to_cpu(desc->num_recs);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 510) node->type = desc->type;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 511) node->height = desc->height;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 512) kunmap(node->page[0]);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 513)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 514) switch (node->type) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 515) case HFS_NODE_HEADER:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 516) case HFS_NODE_MAP:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 517) if (node->height != 0)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 518) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 519) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 520) case HFS_NODE_LEAF:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 521) if (node->height != 1)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 522) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 523) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 524) case HFS_NODE_INDEX:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 525) if (node->height <= 1 || node->height > tree->depth)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 526) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 527) break;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 528) default:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 529) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 530) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 531)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 532) rec_off = tree->node_size - 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 533) off = hfs_bnode_read_u16(node, rec_off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 534) if (off != sizeof(struct hfs_bnode_desc))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 535) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 536) for (i = 1; i <= node->num_recs; off = next_off, i++) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 537) rec_off -= 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 538) next_off = hfs_bnode_read_u16(node, rec_off);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 539) if (next_off <= off ||
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 540) next_off > tree->node_size ||
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 541) next_off & 1)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 542) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 543) entry_size = next_off - off;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 544) if (node->type != HFS_NODE_INDEX &&
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 545) node->type != HFS_NODE_LEAF)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 546) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 547) key_size = hfs_bnode_read_u16(node, off) + 2;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 548) if (key_size >= entry_size || key_size & 1)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 549) goto node_error;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 550) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 551) clear_bit(HFS_BNODE_NEW, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 552) wake_up(&node->lock_wq);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 553) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 554)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 555) node_error:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 556) set_bit(HFS_BNODE_ERROR, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 557) clear_bit(HFS_BNODE_NEW, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 558) wake_up(&node->lock_wq);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 559) hfs_bnode_put(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 560) return ERR_PTR(-EIO);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 561) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 562)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 563) void hfs_bnode_free(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 564) {
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 565) int i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 566)
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 567) for (i = 0; i < node->tree->pages_per_bnode; i++)
21f2296a598c4 (Anton Salikhmetov 2010-12-16 18:08:39 +0200 568) if (node->page[i])
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 569) put_page(node->page[i]);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 570) kfree(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 571) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 572)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 573) struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 574) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 575) struct hfs_bnode *node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 576) struct page **pagep;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 577) int i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 578)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 579) spin_lock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 580) node = hfs_bnode_findhash(tree, num);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 581) spin_unlock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 582) if (node) {
d614267329f2b (Joe Perches 2013-04-30 15:27:55 -0700 583) pr_crit("new node %u already hashed?\n", num);
634725a92938b (Roman Zippel 2006-01-18 17:43:05 -0800 584) WARN_ON(1);
634725a92938b (Roman Zippel 2006-01-18 17:43:05 -0800 585) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 586) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 587) node = __hfs_bnode_create(tree, num);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 588) if (!node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 589) return ERR_PTR(-ENOMEM);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 590) if (test_bit(HFS_BNODE_ERROR, &node->flags)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 591) hfs_bnode_put(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 592) return ERR_PTR(-EIO);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 593) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 594)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 595) pagep = node->page;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 596) memset(kmap(*pagep) + node->page_offset, 0,
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 597) min_t(int, PAGE_SIZE, tree->node_size));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 598) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 599) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 600) for (i = 1; i < tree->pages_per_bnode; i++) {
09cbfeaf1a5a6 (Kirill A. Shutemov 2016-04-01 15:29:47 +0300 601) memset(kmap(*++pagep), 0, PAGE_SIZE);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 602) set_page_dirty(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 603) kunmap(*pagep);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 604) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 605) clear_bit(HFS_BNODE_NEW, &node->flags);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 606) wake_up(&node->lock_wq);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 607)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 608) return node;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 609) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 610)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 611) void hfs_bnode_get(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 612) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 613) if (node) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 614) atomic_inc(&node->refcnt);
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 615) hfs_dbg(BNODE_REFS, "get_node(%d:%d): %d\n",
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 616) node->tree->cnid, node->this,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 617) atomic_read(&node->refcnt));
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 618) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 619) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 620)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 621) /* Dispose of resources used by a node */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 622) void hfs_bnode_put(struct hfs_bnode *node)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 623) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 624) if (node) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 625) struct hfs_btree *tree = node->tree;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 626) int i;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 627)
c2b3e1f76e5c9 (Joe Perches 2013-04-30 15:27:54 -0700 628) hfs_dbg(BNODE_REFS, "put_node(%d:%d): %d\n",
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 629) node->tree->cnid, node->this,
2753cc281c9a0 (Anton Salikhmetov 2010-12-16 18:08:38 +0200 630) atomic_read(&node->refcnt));
0bf3ba538a150 (Eric Sesterhenn 2006-04-01 01:14:43 +0200 631) BUG_ON(!atomic_read(&node->refcnt));
a5e3985fa0140 (Roman Zippel 2005-09-06 15:18:47 -0700 632) if (!atomic_dec_and_lock(&node->refcnt, &tree->hash_lock))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 633) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 634) for (i = 0; i < tree->pages_per_bnode; i++) {
74f9c9c258249 (Roman Zippel 2005-08-01 21:11:41 -0700 635) if (!node->page[i])
74f9c9c258249 (Roman Zippel 2005-08-01 21:11:41 -0700 636) continue;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 637) mark_page_accessed(node->page[i]);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 638) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 639)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 640) if (test_bit(HFS_BNODE_DELETED, &node->flags)) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 641) hfs_bnode_unhash(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 642) spin_unlock(&tree->hash_lock);
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 643) if (hfs_bnode_need_zeroout(tree))
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 644) hfs_bnode_clear(node, 0, tree->node_size);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 645) hfs_bmap_free(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 646) hfs_bnode_free(node);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 647) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 648) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 649) spin_unlock(&tree->hash_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 650) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 651) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 652)
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 653) /*
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 654) * Unused nodes have to be zeroed if this is the catalog tree and
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 655) * a corresponding flag in the volume header is set.
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 656) */
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 657) bool hfs_bnode_need_zeroout(struct hfs_btree *tree)
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 658) {
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 659) struct super_block *sb = tree->inode->i_sb;
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 660) struct hfsplus_sb_info *sbi = HFSPLUS_SB(sb);
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 661) const u32 volume_attr = be32_to_cpu(sbi->s_vhdr->attributes);
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 662)
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 663) return tree->cnid == HFSPLUS_CAT_CNID &&
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 664) volume_attr & HFSPLUS_VOL_UNUSED_NODE_FIX;
2cd282a1bc6b9 (Sergei Antonov 2014-06-06 14:36:28 -0700 665) }
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
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